
/**
 * Copyright 2009 cestum.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.waveprotocol.wave.model.document.operation.algorithm {
import org.waveprotocol.wave.model.document.operation.AnnotationBoundaryMap;
import org.waveprotocol.wave.model.document.operation.Attributes;
import org.waveprotocol.wave.model.document.operation.AttributesUpdate;
import org.waveprotocol.wave.model.document.operation.BufferedDocOp;
import org.waveprotocol.wave.model.document.operation.EvaluatingDocOpCursor;
import org.waveprotocol.wave.model.document.operation.algorithm.cache.CharsCache;
import org.waveprotocol.wave.model.document.operation.algorithm.cache.DelCharsCache;
import org.waveprotocol.wave.model.document.operation.algorithm.cache.EmptyCache;
import org.waveprotocol.wave.model.document.operation.algorithm.cache.SkipCache;

/**
 * A normalizer for mutation events that affect ranges.
 *
 */
public final class RangeNormalizer implements EvaluatingDocOpCursor {

  public var emptyCache:Cache;

  public var skipCache:Cache;

  public var charactersCache:Cache;

  public var deleteCharactersCache:Cache;

  public var target:EvaluatingDocOpCursor;
  public var cache:Cache;

  public function RangeNormalizer(target:EvaluatingDocOpCursor) {
    this.target = target;
	emptyCache= new EmptyCache(this);	
	skipCache= new SkipCache(this);	
	charactersCache =  new CharsCache(this);	
	deleteCharactersCache = new DelCharsCache(this);
	cache= emptyCache;
  }

  
  public function finish():BufferedDocOp {
    cache.flush();
    return target.finish();
  }

  
  public function retain(itemCount:int):void {
    cache.skip(itemCount);
  }

  
  public function characters(chars:String):void {
    cache.characters(chars);
  }

  
  public function elementStart(type:String, attrs:Attributes):void {
    cache.flush();
    target.elementStart(type, attrs);
  }

  
  public function elementEnd():void {
    cache.flush();
    target.elementEnd();
  }

  
  public function deleteCharacters(chars:String):void {
    cache.deleteCharacters(chars);
  }

  
  public function deleteElementStart(type:String, attrs:Attributes):void {
    cache.flush();
    target.deleteElementStart(type, attrs);
  }

  
  public function deleteElementEnd():void {
    cache.flush();
    target.deleteElementEnd();
  }

  
  public function replaceAttributes(oldAttrs:Attributes, newAttrs:Attributes):void {
    cache.flush();
    target.replaceAttributes(oldAttrs, newAttrs);
  }

  
  public function updateAttributes(attrUpdate:AttributesUpdate):void {
    cache.flush();
    target.updateAttributes(attrUpdate);
  }

  
  public function annotationBoundary(map:AnnotationBoundaryMap):void {
    cache.flush();
    target.annotationBoundary(map);
  }

}
}